Typewriting machine



Dec- 15, 1925 E. B. ERIKSEN TYPEWRI'IING MACHINE Original FiledApril 18. 1922 fisiiiiiiiiiiiiiiiih i? l m Patented Dec. 15, 1925.

UNITED STATES PATENT OFFICE.

EINAB B. EBIKSEN, OF BROOKLYN, NEW YORK, ASSIGNOB, BY MESNE ASSIGNMENTS, TO BATES-ROEIBLING PATENTS CO. INC., OF NEW YORK.

TYPEWRITIN G MACHINE.

Application filed April 18, 1922, Serial No. 555,496. Renewed March 12, 1925.

To all whom it may concern:

Be it known that I, EINAR B. ERIKSEN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

My invention relates to typewriting ma- 7 chines and particularly to a type action therefor. An object of my invention is to provide a type action that will be simple and eflicient, but of such character that it can be embodied in a machine of small size.

Another object of the invention is to provide an action that will avoid the noise inherent in the usual swinging action employed in the larger number of machines at the present day.

Further objects will be apparent from the following detailed description and the appended claims.

In the drawings:

Figure 1 is a longitudinal section-through the machine showing a single action with the parts in normal position.

Figure 2 is a similar view showing the parts in an intermediate position.

Figure 3 is a similar view showing the position of the parts at the moment of printing.

A frame 1 of any suitable shape and size has a key lever 2 pivoted thereto at 3. Said key lever is provided with a key 4 and is returned by a spring 5 connected at one end to the lever and at its other end to a lug 6 on the front plate of the frame. A type bar 7 normally lying in horizontal position has type 8 at one end thereof which rest on an inking pad 9 attached to or adjacent to a stop plate 10. The other end of the type bar 7 abuts against a stop 11 and rests on a guide 12. Depending from the lower side of the bar 7 are twoarms 13 and 14. A bell i crank lever 15 pivoted on a pivot rod 16 has a roller 17 on its upper end that lies in the space between the arms 13 and 14 and by its engagement with these arms produces the to and fro movement of the bar 7.

The lower arm of the bell crank has pivoted thereto at 18 a short link 19. Pivoted to the link 19 at 20 is a spring 21, the other end of which is fastened rigidly at 22 to the key lever 2. A universal bar 23 underlies the key levers and works in a guide 24 against a spring 25. This universal bar has an upright 26 near its center supporting at its upper end a bar 27 that overlies the type bar 7 when the latter is moved to overlie the usual platen A. A guide plate 28 overlies the type bar 7 and acts also as a stop plate at the end of the printing move- -ment, as will be hereinafter described.

\Vhen theparts are in normal position, they will lie as in Figure l. A depression of the key lever 2 will force down the spring 21 which will carry the link 19 with it and cause the bell crank 15 to rotate/about its pivot 16, carrying the type bar 7 toward the platen as shown in Figure 2. hen the parts have reached this position, the type 8 overlie the printing point and the arm 1% has come against the stop plate 10 limiting the longitudinal movement of the bar 7.

In the succeeding movement of the key lever, the lever 2 and the spring 21 will approach each other slightly and the lever 2 will press down the universal bar 23 against the force of the spring 25, thus pulling down on the bar 27 and pressing the type against the platen A. The type bar 7 will rock in this movement about a fulcrum formed by the top edge of the plate 10, and will be limited in its movement by its contact with the plate 28. At this time the parts will occupy the position shown in Figure 3. Upon the release of the key lever, the springs 5 and 23 will return the parts to normal position, the movement of the type bar being stopped by the stop 11 and the plate 12.

It will be noted that the movement of the type bar comprises two separate movements substantially at right angles to each other, the final movement being very short, about one-quarter of an inch, and the printing is produced by pressure rather than by the impact resulting from momentum. This eliminates substantially all of the noise that results from type actions of the usual kind.

It is further noted that the movement of the type bar in both directions is produced by a continuous movement of the key lever in one direction. The yielding spring 21 not only permits this result to be achieved, but cushions the downward movement of the key lever giving a very pleasant action.

While only one type action has been shown, it is understood that the entire system of type bars will be arranged in any appropriate manner, each type bar on a line radiating from the printing point as a center. The key levers will be arranged in four banks with the universal keyboard. The top guide will be supported from the sides of the frame in any desired manner, and there may be one or more posts 26. All contacting parts will be provided with suitable buffer stops to avoid noise.

So far as the other instrumentalities of the machines are concerned, they may be of any desired type. The use of an inking pad 9 dispenses with the need of ribbon holding and driving mechanism and simplifies the structure to a great degree.

I claim as my invention:

1. In a typewriting machine, a type ac tion comprising a type bar, a key lever, a. bell crank lever, one arm of the bell crank lever engaging the type bar, a link pivoted at the other end of the bell crank lever, and a fiat spring pivoted to said link at one end and rigidly fastened to the key lever at the other end.

In a typewriting machine, a type bar, a key lever, and operating connections between the type bar and the key lever including a flat spring rigidly attached to the key lever and a bell crank looselyengaging the type bar.

In a typewriting machine, a type action comprising a type bar, a key lever, intermediate connections between the type bar and the key lever comprising a spring by which the type bar is moved in one direction to a position opposite the printing point, and means operated by the key lever after the completion of the first movement and during the yielding of the spring to move the type bar in another direction to print.

4:. In a typewriting machine, a type action comprising a type bar, a key lever, a bell crank lever having one end loosely engaging I the type bar, an intermediate member connected to the other end of the bell crank lever, and a spring connected to the intermediate member and to the key lever, the first part of the movement of the type bar being in one direction and the latter part being in another direction and taking place as the spring yields.

5. In a typewriting machine, a type action comprising a sliding and rocking type bar, a key lever, a bell crank lever connected to the type bar, and connections from the bell crank lever to the key lever comprising a spring, the depression ofuthe key lever to a certain point operating to slide the type bar through said connections, and means operated by the key lever'on a further depression thereof permitted by the spring for rocking the type bar.

6. In a typewriting machine, a type action comprising a sliding type bar, a key lever, a bell crank lever loosely engaging the type bar, a link attached to the other end of the bell crank, and a flat spring rigidly fastened to the key lever and pivoted to the link.

7. In a typewriting machine, the combination of a sliding and rocking type bar, a

stop for limiting its sliding movement, a key lever, operating means including a spring in the connections between the type bar and key lever which act to slide the type bar upon a depression of the key lever, and means operated by a further depression of the key lever after the sliding movement of the type bar has been stopped, to rock said type bar, said further depression being permitted by the yielding of the spring.

In testimony whereof I aflix my signature.

EINAR B. ERIKSEN. 

